Just listened to one of the Japanese supporting acts on Corpse Furnace's Japan tour next year, Fissure(JP). Holy fuck, this band is real deal old school thrashy death metal. The siblings Iori & Ryuji Marufuji are definitely know what they're doing when it comes to heavy.

Iori does bass & growls while Ryuji does solely guitar. Iori's vox just pummels hard on those growls, despite the lyrics are heavily in Japanese.